Hi,
When I last used dooble, I had cookie crusher turned on and some tabs open and the cookies for the open tabs were being deleted (crushed).
I think the preferred behaviour would to be not to crush cookies from open tabs. Ie. only delete cookies when the tabs are closed; not when while they're open.
Looking forward to hearing back to you ... there may or may not be a small bounty attached to this issue.
Cheers,
Josh